#!/bin/bash

s1_generate_a_series_of_files(){
for i in {1..100}; do echo "$i" > "tmp/new_file$i"
done
}
s2_list_4_files_in_long_format_about_account_and_group() {
ls -l /etc/{passwd,shadow,group,gshadow} |sort -d
}
s3_find_items_related_to_given_username(){
grep -h $1 /etc/{passwd,shadow} |sort -d
} 
s4_find_items_related_to_given_group_name(){
grep -h $1 /etc/{group,gshadow} |sort -d
}
s5_create-groups_for_given_group_names(){
groupadd rnd && groupadd itoperation
}

s6_create_users_and_set_their_group_as_required(){

useradd -G rnd adam && useradd -G rnd bob && useradd -G itoperation calvin && useradd -G itoperation david && useradd -G rnd edward

}
s7_change_users_shell(){
usermod -s /usr/bin/sh adam && usermod -s /usr/bin/sh edward
}
s8_set_password_change_policy() {
local usernames=("adam" "bob" "calvin" "david" "edward")
for username in "${username[@]}"; do
chage -M 60 -m 10 -W  10 "$username"
done
}
function s9_set_password_for_file_users(){
usernames=(adam bob calvin david edward)
for i in $(seq 1 5);do echo ${!i};echo $(($i-1));done
echo "${usernames[0]}:$1" |chpasswd
echo "${usernames[1]}:$2" |chpasswd
echo "${usernames[2]}:$3" |chpasswd
echo "${uesrnames[3]}:$4" |chpasswd
echo "${usernames[$(( $i-1 ))]}:$5" | chpasswd
}
s10_lock_bobs_password() {
usermod -L bob
}
# s11_include_adam_into_wheel_group
function s11_include_adam_into_wheel_group(){
usermod -a -G wheel adam
}
function s12_change_files_permission() {
for i in {1..33};do chmod -R 604 /tmp/new_file$[3*i];done
}
